APCSmart-UPS On-Line, 4200 Watts / 6000 VA,Input208V / Output120V, 208V, Interface Port Smart-Slot, Extended runtime model, Rack Height 3U. Includes: CD with software, Rack Mounting support rails, Removable support feet, Smart UPS signalling RS-232 cable, User Manual. Multiple output voltagesAutomatic internal bypass - Supplies utility power to the connected loads in the event of a UPS overload condition or fault.Scalable runtime - Allows additional run time to be quickly added as needed.Intelligent battery management - Maximizes battery performance, life, and reliability through intelligent, precision charging.Hot-swappable batteries - Ensures clean, uninterrupted power to protected equipment while batteries are being replacedAutomatic restart of loads after UPS shutdown - Automatically starts up the connected equipment upon the return of utility power.Temperature-compensated battery charging - Prolongs battery life by regulating the charge voltage according to battery temperature.Network manageable - Provides remote management of the UPS over the network.InfraStruXure Manager Compatible - Enables centralized management via the APC InfraStruXure Manager.SmartSlot - Customize UPS capabilities with management cards.LED status indicators - Quickly understand unit and power status with visual indicators.Serial Connectivity - Provides management of the UPS via a serial port.Plug-and-Play external batteries - Ensures clean, uninterrupted power to the loads when adding extra runtime to the UPS.Rack/Tower convertible - Protects the initial investment in the UPS when migrating from tower to rack-mount environment.Flash upgradeable firmware - Install maintenance releases of firmware remotely using FTP.User-replaceable batteries - Increases availability by allowing a trained user to perform upgrades and replacements of the batteries reducing Mean Time to Repair (MTTR)Automatic self-test - Periodic battery self-test ensures early detection of a battery that needs to be replaced.Predicitive failure notification - Provides early-warning fault analysis ensuring proactive component replacement.Disconnected battery notification - Warns when a battery is not available to provide backup power.Audible alarms - Provides notification of changing utility power and UPS conditions.Frequency and voltage regulation - Gives higher application availability by correcting poor frequency and voltage conditions without using the battery.Power conditioning - Protects connected loads from surges, spikes, lightning, and other power disturbances.Input power factor correction - Minimizes installation costs by enabling the use of smaller generators and cabling.Generator compatible - Ensures clean, uninterrupted power to protected equipment when generator power is used.Cold-start capable - Provides temporary battery power when the utility power is out.Resettable circuit breaker - Easy recovery from overloads; no need to replace a fuse.Safety-agency approved - Ensures the product has been tested and approved to work safely with the connected service provider equipment and within the specified environment. UL, FCC, CE, C-Tick approvals.